Arch-plate for steam-boiler furnaces



(No Model.)

J. FEA 81,- Wj H. HOAG. ARCH PLATE PoR STEAM BOILER PURNAGBS.

No. 448,218. Patented Mar. 17, 18911.

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JOHN FEA AND WILLIAM H. HOA

ARCH-PLATE FOR STEA G, OF AMSTERDAM, NEW' YORK.

M- BOILER FU RNACES.

SPECIFICATION forming part of Letters Patent No. 448,218, dated March 17, 1891.

Application filed October 29, 1890. Serial No. 369,644. (No model.)

To all whom it may concern:

Be it known that we, JOHN FEA and WIL- LIAM H. HOAG, citizens of the United States, residing at Amsterdam, in the county of Montgomery and State of New York, have invented certain new and useful Improvements in Arch- Plates for Steam-Boiler Furnaces; and we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

Our invention lelates to improvements in the construction of the front and rear arches of steam-boiler furnaces, also roofs of puddling or other furnaces where intense heatl is maintained; and it consists in the combination, with the ordinary brick walls of the furnace, of auxiliary or supplementary arches.

It also consists in the special construction of the parts, as will be hereinafter described; and the objects of our improvements are, ii rst, to provide in place of the solid iron archplates that are exposed to the direct action of the heat and quickly destroyed a combination-arch, which shall be more durable, and which will protect and sustain the brickwork of the furnace contiguous and adjacent to the arch in a better and more durable manner than any heretoforeV in use, and, second, to provide for the dispersing of latent heat, so as to reduce expansion and contraetion of the parts of which it is composed.

H eretofore in the construction of steamboiler furnaces iron bars or rails have been used to span the walls of the furnace, transversely, upon which the brick-Work has been built. Extreme heat causes the metal of which the rails are composed to expand, warp out of shape, and sag under the weight of the brick, thereby obstructing the passage of heat through the uppermost series of lines of the boiler, and eventually the whole arch collapses. The throat-plate or front-door arch of the boiler is also affected in the same manner and frequently melts and collapses.

Referring to the accompanying drawings, Figure l is a longitudinal sectional elevation of an ordinary steam-boiler furnace embodying our improvements in relative position with the boiler A-and walls B and B'; Fig. 2, a vertical section of a part of our invention on the line l l, Fig. l, wherein a sectional elevation of the side walls of the furnace is also shown; Fig. 3, an enlarged plan of plates C with portions of the top removed for eX- posing to View the openings e, leading from the air-cham ber E through the bottom of plate C; Fig. 4, a longitudinal section of same on the line 2 2,1ig. 3, wherein is shown the plate 6o O, with the air-ch amber E and apertures e leading therefrom, the hollow conoids or brackets d, attached to plate C and spanning openings e, around which a portion of refractory material Q is shown secured to plate C; Fig. 5, a sectional transverse view of the hollow plates C VC on the line 3 3, Fig. 3, showing the air-chambers E E, also portions or parts of pipe o', carried through the series of brackets or conoids d; and Fig. 6 is a detailed plan of 7o the entire series of openings e in hollow' plates C C, with the conoids or brackets d spanning the openings e and a continuous line of pipe 0', passing through the brackets d.

Similar letters of referencerefer to similar parts throughout the several views.

'lo carry our invention into effect we construct a metal matrix or hollow form C, of cast or wrought iron, of suitable dimensions to span the walls of the furnace transversely 8o and suflieiently wide to form the arch necessary to be used. In some cases, where a wide arch is required, we prefer to make the chambered form C in two or more sections or parts provided with lugs Z Z, by which thev are held together and secured firmly with bolts. (See Figs. l, 2, 3, and 5.) The chambered plates or form O have a series of equidistant perforations or apertures e, which communicate with the air-chamber E through one side of the 9o wall of plates C. On the outer or downward side of the plate C the apertures are spanned by an equal number of hollow conoids or brackets d, secured to and formed of the same material as the plates C. The walls of these holiow conoids or brackets d are perforated dia-metrically, said prforations communicating with the apertures in plate C.

'A continuous conduit or line of metalpipe 0 is introduced and carried through the aperroc tures in the conoids d, (see Fig. 6,) said pipe being made in sections and joined together with close-fitting elbow-joints, as shown, and is made to connect with the air-chamber E at one elld of plate C by lllealls of the elbow e2. The pipe o is solllewllat slnaller ill diameter than the apertures ill conoids or brackets CZ, so as to allow lire-clay or otller refractory material Q in a plastic state to be packed betweell the pipe o and walls of the colloids or brackets d and illto all the cavities or apertures in the brackets (l, alld said refractory material Q, is also applied to the surface of the plate around and over the colloids l and pipe o', so as to civelall portions of said colloids alld pipe alld inclose the same, so tllat tlley will be substantially wholly elllbedded witll ill the body of the plastic refractory material (.2. The plastic material Q is lnade of 'lire-clay or ground firebrick, or a mixture of botll, or other refractory lllaterial or ingredients-as for illstallce7 the com peulld described ill Letters Patent No. Q-il.

In the operation of applying the plastic lllaferial over thesurfaces to be protected the said material is to be worked over alld about the colloids or brackets d, so as to clincll and hold witll the perforated walls of sallle alld be securely held alld retained ill place against the plate C wholly and substantially by lllealls of the perforated colloids or brackets (Z. (See Figs. l, 2, alld al.)

The refractory material Q, lnay be applied before or after the plates C are placed ill the walls of the furnace; but we prefer to pursue the latter course, as the plates can be lllore easily handled alld lllore perfect jointing effected witll the walls. (See Figs. lv and 2.)

The terminal end of pipe oserves as a sup ply-pipe to lead cold air from a convenient source to the conduit-pipe o', tllrough which it ruslles by its own pressure by way of the elbow c2 illto chamber E, wllerein the air, rareed by the furnace heat, has produced a partial vacuum and passed tl'lrough connecting-pipe N illto the second chamber E, the rareh'ed air in which having passed from saule by natural draft through the outlet-pipe P, wllicll is collstructed (but not sllown ill drawings) to have access to the atlllospllere outside the boiler-house. The apertures e, spanned by the perforated brackets (l, allow the lnoist ure ill refractory colllponlld wllile in a plastic state, especially that portion contiguous to metal plates (l and brackets d, to evaporate alld escape illto the air-cllalnber E, allow superfluous heat communicated to the compound or material Q, wllile the furnace is being` operated, to enter cllalnber E and escape through the vellt or pipe P. The perforatiolls c also telld to prevent expansion of the plates G by making tlleln non-conducting, and it is evident that a circulation of air through the cllalnber E will dispel the moisture that arises and afterward disperse the latent heat as rapidly as it is generated.

It will of collrse be understood that the vfront alld rear arclles'7 as sllowll in Fig. l, are silllilar ill the lnaill points of construction, having slight lllinor differences in their collvformation to correspond with the configura! tioll of the furnace parts to be protected.

The cllalnbered plates C alld their colllvlollellt parts lnay be lllade either stra-iglt, curved,or arched to suit the purpose without changing the nature of our invention.

Having fully described our invention, wllat we clailn jointly, alld desire to secure by Letters Patent, is-

l. The combination, with the front alld rear walls in a steanl-boiler furnace, of hollow cllalllbered perforated plates provided with hollow llletallic colloids or brackets secured to the plates alld spanning the perforations ill the plates, said hollow conoids or brackets having parts or portions of their walls perforated or renloved, wllereby a refractory comu pound or material can be held and secured to the plates, all substantially as specified.

2. The combination of the hollow cllanlbered llletal plates perforated and spanned by hollow'perforated colloids 0r brackets CZ, the conduit-pipe o', passing through the perforations in the brackets CZ alld held in place by the refractory material, the elbow e2, the connecting-pipe N, the outlet-pipe P, and the refractory compound or lllaterial Q, secured to the plates C by means ot' the perforated colloids or brackets CZ, as described, all adapted to be used, substantially as and for the purpose specified .and set forth.

In testilllolly of which we have siglled our llames in the presence of two witnesses.

JOHN FEA. WILLIAM H. HOA@ Witnesses:

HENRY V. lunku, WILLIAM I". Moolen. 

